Abstract
We report on a 2ω-OPSL-pumped passively Q-switched Pr3+:LiYF4 laser operating at the wavelengths of 523, 607, and 640nm. For this, we utilized a Co2+-doped MgAl2O4 (MALO) crystal as a saturable absorber in the visible range for the first time, to the best of our knowledge. In the green spectral region, the pulse duration was 210ns with a pulse energy of 3.6μJ and a repetition rate of 125kHz. The minimum pulse duration of 87ns at the highest pulse energy of 8.6μJ was obtained at a repetition rate of 110kHz at 607nm. The highest Q-switched average laser power of 1.4W was obtained at an absorbed continuous-wave pump power of 3.3W with a slope efficiency of 47% at 640nm. Absorption saturation measurements with Co:MALO were performed, and ground and excited state absorption cross sections in the visible spectral range were determined.
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